EP4370509A1 - Procédé de production de trifluoroacétates d'alkyle - Google Patents

Procédé de production de trifluoroacétates d'alkyle

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Publication number
EP4370509A1
EP4370509A1 EP22735924.7A EP22735924A EP4370509A1 EP 4370509 A1 EP4370509 A1 EP 4370509A1 EP 22735924 A EP22735924 A EP 22735924A EP 4370509 A1 EP4370509 A1 EP 4370509A1
Authority
EP
European Patent Office
Prior art keywords
alkyl
crc
phenyl
process according
formula
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22735924.7A
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German (de)
English (en)
Inventor
Joachim Gebhardt
Manfred Ehresmann
Marcus ZEUMKE
Roland Goetz
Martin Sesing
Daniel Maximilian KNOLL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
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Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP4370509A1 publication Critical patent/EP4370509A1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/08—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D271/00—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms
    • C07D271/02—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms not condensed with other rings
    • C07D271/06—1,2,4-Oxadiazoles; Hydrogenated 1,2,4-oxadiazoles
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/48—Separation; Purification; Stabilisation; Use of additives
    • C07C67/52—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
    • C07C67/54—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
    • C07C69/62—Halogen-containing esters
    • C07C69/63—Halogen-containing esters of saturated acids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Definitions

  • the present invention relates to a process for producing alkyl trifluoroacetates (ATFA) by reacting trifluoroacetic acid (TFA) with an alkyl alcohol R-OH in an aqueous solution, and wherein the alkyl trifluoroacetate is separated from the reaction medium by means of direct rectification.
  • the present invention relates to a process for recovering trifluoroacetic acid in the form of alkyl trifluoroacetates from aqueous waste-water streams of preceding chemical transformations leading to substituted 3-aryl-5-trifluoromethyl- 1,2,4- oxadiazoles.
  • These compounds are known to be useful for controlling phytopathogenic fungi, for example from WO 2015/185485 A1 and WO 2017/211649 A1.
  • Prior art references typically suggest producing ATFA by reacting TFA with an alcohol in the absence of water and employing a strong acid in amounts that may be catalytic, stoichiometric, or in excess.
  • Suitable acids are, for example, concentrated sulfuric acid or acidic resins. If the acid is used in stoichiometric amounts or in excess, it may also serve to retain water formed during the condensation reaction between TFA and the alcohol.
  • ATFA is highly reactive towards nucleophiles and thus prone to hydrolysis, in particular with esters in which the alkyl residue is small (Ci-C3-alcohols).
  • ATFA is (re-)used in chemical transformations such as acetylation reactions, which require water-free conditions.
  • TFA forms a maximum homogeneous azeotropic mixture with water, which has a higher boiling point than TFA alone. A separation of TFA from water by rectification is therefore impossible.
  • JP 11343267 discloses a process comprising reacting TFA dissolved in an aqueous medium containing an alkyl alcohol to obtain ATFA.
  • the authors in this reference likewise refer to the problem that TFA forms azeotropic mixtures with water, suggesting that this problem may be solved by using water-insoluble solvents (dichloromethane, n-octanol) in a two-phased reaction mixture.
  • water-insoluble solvents dichloromethane, n-octanol
  • the alcohol served as the reactant and as water-insoluble solvent providing for the physical separation of the n-octanol ester from the aqueous phase containing the TFA.
  • the reaction involves intermediary steps such as manually separating the (n-octanol) ester from the aqueous medium and then recovering the ester, for example by a sequence of transesterification with a desired lower molecular weight alcohol, e.g. ethanol, and subsequent separation and purification of the ethyl ester by distillation.
  • a desired lower molecular weight alcohol e.g. ethanol
  • the distillate contained only negligible amounts of TFA and water, which means that the ATFA is stable upon storage, i.e. it does not suffer hydrolysis, and the ATFA is sufficiently dry to be used in chemical transformations that ask for very low levels of water.
  • the present invention relates to a process for producing alkyl trifluoroacetates of formula I,
  • variable R is CrC 6 -alkyl or C3-C6-cycloalkyl; the process comprising reacting trifluoroacetic acid with an alkyl alcohol R-OH in an aqueous solution, wherein variable R in alkyl alcohol R-OH has the same meaning as R in the alkyl trifluoroacetate of formula I; and wherein the alkyl trifluoroacetate I is separated from the reaction medium by means of direct rectification.
  • direct rectification shall mean that a suitable rectification column or apparatus is connected to the reaction vessel containing the aqueous reaction mixture and that the rectification process commences from the reaction vessel either without timely delay after charging the reaction vessel with the aqueous mixture of the reactants or after allowing time for the reaction to proceed.
  • alkyl alcohol R-OH is methanol, ethanol, n-propanol, /so-propanol, n-butanol, /so-butanol, sec-butanol, te/f-butanol, cyclopentanol, or cyclohexanol; or mixtures thereof.
  • alkyl alcohol R-OH is methanol, n-propanol, /so-propanol, n-butanol, /so-butanol, sec-butanol, te/f-butanol, cyclopentanol, or cyclohexanol; or mixtures thereof.
  • alkyl alcohol R-OH is methanol, ethanol, n-propanol, or /so-propanol; or mixtures thereof.
  • alkyl alcohol R-OH is methanol, n-propanol, or /so-propanol; or mixtures thereof.
  • R-OH is methanol or ethanol; or mixtures thereof. In another preferred embodiment R-OH is a mixture of methanol and ethanol.
  • R-OH is methanol
  • the amount of alkyl alcohol R-OH in the reaction mixture is equal to or more than the amount of TFA. In a preferred embodiment the amount of alkyl alcohol is 2 equivalents or more than the amount of TFA in the solution.
  • the process of the present invention is typically carried out at atmospheric pressure.
  • the process of the present invention is carried out so that the product is rectified off of the aqueous mixture, which is heated to a temperature between 20°C and 100°C, at atmospheric pressure.
  • the process of the present invention is carried out so that the product is rectified off of the aqueous mixture, which is heated to a temperature between 40°C and 100°C, at atmospheric pressure.
  • the process of the present invention is carried out at a pH of the aqueous medium, which is equal to or lower than 7.
  • the process of the present invention is carried out at a pH of the aqueous medium, which is equal to or lower than 0.
  • the process of the present invention is carried out at a pH of the aqueous medium, which is equal to or lower than 7, and wherein alkyl alcohol R-OH is methanol, ethanol, n-propanol, /so-propanol, n-butanol, /so-butanol, sec-butanol, te/f-butanol, cyclopentanol, or cyclohexanol; or mixtures thereof.
  • alkyl alcohol R-OH is methanol, ethanol, n-propanol, /so-propanol, n-butanol, /so-butanol, sec-butanol, te/f-butanol, cyclopentanol, or cyclohexanol; or mixtures thereof.
  • the process of the present invention is carried out at a pH of the aqueous medium, which is equal to or lower than 7, and wherein the rectification is carried out at a temperature of the reaction mixture between 20°C and 100°C, at atmospheric pressure, and wherein alkyl alcohol R-OH is methanol, ethanol, n-propanol, /so-propanol, n-butanol, /so- butanol, sec-butanol, te/f-butanol, cyclopentanol, or cyclohexanol; or mixtures thereof.
  • the process of the present invention is carried out at a pH of the aqueous medium, which is equal to or lower than 0, and wherein alkyl alcohol R-OH is methanol, ethanol, n-propanol, or /so-propanol; or mixtures thereof.
  • the process of the present invention is carried out at a pH of the aqueous medium, which is equal to or lower than 0, and wherein the rectification is carried out at a temperature of the reaction mixture between 20°C and 100°C, at atmospheric pressure, and wherein alkyl alcohol R-OH is methanol, ethanol, n-propanol, or /so-propanol; or mixtures thereof.
  • the process of the present invention is carried out at a pH of the aqueous medium, which is equal to or lower than 0, and wherein alkyl alcohol R-OH is methanol.
  • the process of the present invention is carried out at a pH of the aqueous medium, which is equal to or lower than 0, wherein the rectification is carried out at a temperature of the reaction mixture between 40°C and 100°C, at atmospheric pressure, and wherein alkyl alcohol R-OH is methanol.
  • rectification apparatus In order to allow for low levels of water in the distillate suitable means for rectification may be considered in the process according to the present invention.
  • the rectification apparatus must provide a certain number of theoretical separator stages, or plates, that will suit the problem at hand. Clearly, this number depends on the physical properties of the reactants as well as the desired water content of the distillate. Therefore, to be able to control the concentration of water in the distillate, the minimum count of theoretical separation steps is chosen so as to optimize the number of plates (or column height) and the energy consumption.
  • the present invention relates to a process for recovering trifluoroacetic acid in the form of alkyl trifluoroacetates from aqueous waste-water streams of preceding chemical transformations leading to substituted 3-aryl-5-trifluoromethyl-1,2,4-oxadiazoles that are known to be useful for controlling phytopathogenic fungi, for example from WO 2015/185485 A1 and WO 2017/211649 A1.
  • the present invention relates to a process for preparing oxadiazole compounds of formula II, wherein
  • A is phenyl or a 5- or 6-membered aromatic heterocycle; wherein the ring member atoms of the aromatic heterocycle include besides carbon atoms 1, 2, 3, or 4 heteroatoms selected from N, O, and S as ring member atoms with the provision that the heterocycle cannot contain 2 contiguous atoms selected from O and S; and wherein A is further unsubstituted or further substituted with additional n identical or different radicals R a ; wherein n is 0,1, 2, 3, or 4;
  • R a is independently selected from the group consisting of halogen, cyano, CrC 6 -alkyl, Ci-C 6 -haloalkyl, CrC 6 -alkoxy, and Ci-C 6 -haloalkoxy;
  • R 2 is hydrogen, CrC 6 -alkyl, C2-C6-alkenyl, C2-C6-alkynyl, CrC 6 -alkoxy, C3-Cn-cycloalkyl,
  • any of the aliphatic or cyclic groups in R 2 are unsubstituted or substituted with 1, 2, 3, or up to the maximum possible number of identical or different radicals selected from the group consisting of halogen, hydroxy, oxo, cyano, CrC 6 -alkyl, CrC 6 -alkoxy, and C3-C11- cycloalkyl;
  • R 1 and R 2 together with the nitrogen atom to which they are attached, form a saturated or partially unsaturated mono- or bicyclic 3- to 10-membered heterocycle, wherein the heterocycle includes beside one nitrogen atom and one or more carbon atoms no further heteroatoms or 1, 2 or 3 further heteroatoms independently selected from N, O, and S as ring member atoms with the provision that the heterocycle cannot contain 2 contiguous atoms selected from O and S; and wherein the heterocycle is unsubstituted or substituted with 1, 2, 3, 4, or up to the maximum possible number of identical or different groups R 1a ; wherein
  • R 1a is halogen, oxo, cyano, NO2, OH, SH, NH 2 , CrC 6 -alkyl, CrC 6 -haloalkyl, CrC 6 -alkoxy, CrC 6 -haloalkoxy, CrC 6 -alkylthio, CrC 6 -haloalkylthio,
  • R 3 , R 4 independently of each other are selected from the group consisting of hydrogen, halogen, cyano, CrC4-alkyl, CrC4-alkenyl, CrC4-alkynyl, CrC4-haloalkyl and CrC4-alkoxy; or
  • step 1 reacting an amidoxime of formula III, wherein the variables A and R A are as defined above for compounds of formula II, with an alkyl trifluoroacetate of formula I,
  • step 2 adding water to the reaction mixture obtained in step 1 and then separating amidoxime
  • step 3 treating the combined aqueous phases obtained in step 2 with an auxiliary acid, whereas the amount of the auxiliary acid is equivalent to or more than the amount of base used in step 1 ;
  • step 4 separating the alkyl trifluoroacetate I from the aqueous phases obtained in step 3 by rectification according to the process as defined or preferably defined herein.
  • a typical procedure involves, that the amidoxime III obtained in step 2, i.e. after addition of water, is separated from the aqueous phase by filtration, whereas the filter cake is further washed with water in order to collect all of the TFA.
  • the combined aqueous phases are then further used in step 3 and 4.
  • step 1 of the above process requires the addition of at least 2 equivalents of ATFA to the amidoxime, based on the amount of amidoxime. Since ATFA is expensive and because high levels of TFA in aqueous waste- streams is a concern for disposal from an ecological perspective, the advantage of this process over processes of the prior art lies in the possibility to recover ATFA in dry form and without TFA in step 3 and feed it back into the process in step 1 without the need of further treatment.
  • step 1 of the process for the production of oxadiazole compounds II generates alcohol R-OH as a by-product.
  • This alcohol is carried through to step 4, which means that there is, in theory, no need to add further alcohol R-OH to the combined aqueous phases in step 4 to accomplish the recovery of ATFA.
  • process step 1 is conducted in the presence of an auxiliary solvent.
  • auxiliary solvent refers to a solvent, which is either identical with alcohol R-OH as defined herein or it may be selected from a dipolar organic solvent which is not identical with alcohol R-OH.
  • Suitable dipolar organic solvents are, for example, ethers (diethylether, dibutylether, te/f-butylmethylether, ethylene glycol dimethyl ether, ethylene glycol, diethyl ether, diethylene glycol dimethyl ether, 2-methyltetrahydrofuran, tetrahydrofuran, dioxane, diethylene, glycol monomethyl- or monoethyl ether), /V-substituted lactams ( N - methylpyrrolidone), carboxamides (A/./V-dimethylformamide, A/./V-dimethylacetamide), acyclic ureas (dimethyl imidazolinum), sulphoxides, sulphones (dimethyl ether), ether
  • the auxiliary solvent in process step 1 for the production of oxadiazole compounds II comprises an alkyl alcohol, preferably an alkyl alcohol R-OH as defined or preferably defined herein.
  • the auxiliary solvent in process step 1 for the production of oxadiazole compounds II comprises methanol or ethanol; particularly the auxiliary solvent is methanol or mixtures of methanol and ethanol.
  • auxiliary acid refers to an acid, which is not identical with TFA and has a pK a below 0.
  • the auxiliary acid in step 3 of the process for the production of oxadiazole compounds II is hydrochloric acid, sulfuric acid, phosphoric acid, or nitric acid.
  • the auxiliary acid in step 3 of the process for the production of oxadiazole compounds II is hydrochloric acid or sulfuric acid.
  • the base in step 1 comprises sodium or potassium Ci-C 6 -alkoxylates.
  • the base in step 1 is sodium methoxide or sodium ethoxide.
  • variable A in compounds of formula II is phenyl.
  • radical R a in compounds of formula II is halogen, CrC 6 -alkyl, CrC 6 -haloalkyl, CrC 6 -alkoxy, or CrC 6 -haloalkoxy; particularly fluorine.
  • n is 1 and R a is fluorine in compounds of formula II.
  • variable n is 0 in compounds of formula II.
  • One aspect the present invention relates to a process for the production of oxadiazole compounds as defined above, wherein the amidoxime is of formula lll.b, lll.b wherein n is 0 or 1 , and the meaning of R a and R A is as defined herein for compounds of formula II, to obtain oxadiazole compounds of formula II.
  • the variables n, R a , and R A have the meaning as defined for compounds of formula lll.b.
  • n is 1 and R a is fluorine in compounds of II. b and lll.b. In a preferred embodiment n is 0 in compounds of formula II. b and lll.b.
  • variables in compounds of formula II, II. b, III and lll.b have the following meaning:
  • R A is fluorine; n is O or l;
  • R 1 is methyl, ethyl, n-propyl, /so-propyl, n-butyl, sec-butyl, iso- butyl, cyclopropyl, 2- methoxyiminoethyl, bicyclo[1.1.1]pentan-1-yl, or phenyl; and wherein the phenyl group is unsubstituted or substituted with 1, 2, 3 or up to the maximum possible number of identical or different radicals selected from the group consisting of fluorine, chlorine, cyano, methyl, ethyl, methoxy, trifluoromethyl, trifluoromethoxy, difluoromethyl, difluoromethoxy, and cyclopropyl;
  • R 2 is hydrogen, methyl, ethyl, methoxy, ethoxy, or cyclopropyl.
  • variables in compounds of formula II, II. b, III and lll.b have the following meaning:
  • R A is fluorine; n is O or l;
  • R 1 is Ci-C 6 -alkly, phenyl, or cyclopropyl, wherein the phenyl ring is unsubstituted or substituted with 1 , 2, 3, or 4 identical or different groups selected from halogen;
  • R 2 is hydrogen, methyl, ethyl, methoxy, ethoxy, or cyclopropyl.
  • variables in compounds of formula II, II. b, III and lll.b have the following meaning:
  • R A is fluorine
  • R 1 is CrC 6 -alkly, or cyclopropyl
  • R 2 is hydrogen, methyl, methoxy, ethoxy, or cyclopropyl.
  • variables in compounds of formula II, II. b, III and lll.b have the following meaning:
  • R A is fluorine; n is O or l;
  • R 1 is methyl or phenyl, wherein the phenyl ring is unsubstituted or substituted with 1, 2, 3, or 4 identical or different groups selected from halogen;
  • R 2 is hydrogen, methyl, ethyl, methoxy, or ethoxy.
  • variables in compounds of formula II, II. b, III and lll.b have the following meaning: n is 0;
  • R 1 is methyl, 2-methoxyiminoethyl, bicyclo[1.1.1]pentan-1-yl, 2-fluoro-phenyl, 4-fluoro- phenyl, or 2,4-difluorophenyl; in particular methyl or 2-fluoro-phenyl;
  • R 2 is hydrogen
  • the compound of formula II. b as defined or preferably defined herein, and wherein n is 0 and R A is -C( 0)NR 1 R 2 , is used to obtain a compound of formula IV, as described i the references cited therein; particularly for the preparation of compounds of formula IV, wherein R 1 is methyl or 2-fluoro-phenyl and R 2 is hydrogen.
  • C n -C m indicates the number of carbon atoms possible in each case in the substituent or substituent moiety in question.
  • halogen refers to fluorine, chlorine, bromine and iodine.
  • CrC 6 -alkyl refers to a straight-chained or branched saturated hydrocarbon group having 1 to 6 carbon atoms, for example methyl, ethyl, propyl, 1-methylethyl, butyl, 1-methylpropyl, 2-methylpropyl, and 1,1-dimethylethyl.
  • C2-C6-alkenyl refers to a straight-chain or branched unsaturated hydrocarbon radical having 2 to 6 carbon atoms and a double bond in any position, such as ethenyl, 1-propenyl, 2- propenyl (allyl), 1-methylethenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-methyl-1-propenyl, 2-methyl-
  • C2-C6-alkynyl refers to a straight-chain or branched unsaturated hydrocarbon radical having 2 to 6 carbon atoms and containing at least one triple bond, such as ethynyl, 1-propynyl,
  • 2-propynyl (propargyl), 1-butynyl, 2-butynyl, 3-butynyl, 1-methyl-2-propynyl.
  • CrC 6 -haloalkyl refers to a straight-chained or branched alkyl group having 1 to 6 carbon atoms (as defined above), wherein some or all of the hydrogen atoms in these groups may be replaced by halogen atoms as mentioned above, for example chloromethyl, bromomethyl, dichloromethyl, trichloromethyl, fluoromethyl, difluoromethyl, trifluoromethyl, chlorofluoromethyl, dichlorofluoromethyl, chlorodifluoromethyl, 1-chloroethyl, 1-bromoethyl, 1- fluoroethyl, 2-fluoroethyl, 2,2-difluoroethyl, 2,2,2-trifluoroethyl, 2-chloro-2-fluoroethyl, 2-chloro- 2,2-difluoroethyl, 2,2-dichloro-2-fluoroethyl, 2,2,2-tri chloroethy
  • CrC 6 -alkoxy refers to a straight-chain or branched alkyl group having 1 to 6 carbon atoms (as defined above) which is bonded via an oxygen, at any position in the alkyl group, for example methoxy, ethoxy, n-propoxy, 1-methylethoxy, butoxy, 1-methylpropoxy, 2- methylpropoxy or 1,1-dimethylethoxy.
  • CrC 6 -haloalkoxy refers to a CrC 6 -alkoxy group as defined above, wherein some or all of the hydrogen atoms may be replaced by halogen atoms as mentioned above, for example, OCH2F, OCHF2, OCF3, OCH2CI, OCHCI2, OCCI3, chlorofluoromethoxy, dichlorofluoromethoxy, chlorodifluoromethoxy, 2-fluoroethoxy, 2-chloroethoxy, 2-bromoethoxy, 2-iodoethoxy, 2,2- difluoroethoxy, 2,2,2-trifluoroethoxy, 2-chloro-2-fluoroethoxy, 2-chloro-2,2-difluoroethoxy, 2,2- dichloro-2-fluoroethoxy, 2,2,2-trichloroethoxy, OC2F5, 2-fluoropropoxy, 3-fluoropropoxy, 2,2- difluoropropoxy, 2,3-diflu
  • phenyl-CrC4-alkyl or heteroaryl-Ci-C4-alkyl refer to alkyl having 1 to 4 carbon atoms (as defined above), wherein one hydrogen atom of the alkyl radical is replaced by a phenyl or hetereoaryl radical respectively.
  • CrC4-alkoxy-Ci-C4-alkyl refers to alkyl having 1 to 4 carbon atoms (as defined above), wherein one hydrogen atom of the alkyl radical is replaced by a CrC4-alkoxy group (as defined above).
  • CrC4-alkylthio-CrC4-alkyl refers to alkyl having 1 to 4 carbon atoms (as defined above), wherein one hydrogen atom of the alkyl radical is replaced by a CrC4-alkylthio group.
  • CrC 6 -alkylthio refers to straight-chain or branched alkyl groups having 1 to 6 carbon atoms (as defined above) bonded via a sulfur atom. Accordingly, the term “CrC 6 -haloalkylthio” as used herein refers to straight-chain or branched haloalkyl group having 1 to 6 carbon atoms (as defined above) bonded through a sulfur atom, at any position in the haloalkyl group.
  • hydroxyCrC4-alkyl refers to alkyl having 1 to 4 carbon atoms, wherein one hydrogen atom of the alkyl radical is replaced by a OH group.
  • aminoCrC4-alkyl refers to alkyl having 1 to 4 carbon atoms, wherein one hydrogen atom of the alkyl radical is replaced by a NH2 group.
  • CrC 6 -alkylamino refers to an amino group, which is substituted with one residue independently selected from the group that is defined by the term CrC 6 -alkyl.
  • diCrC 6 -alkylamino refers to an amino group, which is substituted with two residues independently selected from the group that is defined by the term CrC 6 -alkyl.
  • Ci-C4-alkylamino-CrC4-alkyl refers to refers to alkyl having 1 to 4 carbon atoms (as defined above), wherein one hydrogen atom of the alkyl radical is replaced by a CrC4-alkyl-NH- group which is bound through the nitrogen.
  • diCi-C4-alkylamino-CrC4-alkyl refers to refers to alkyl having 1 to 4 carbon atoms (as defined above), wherein one hydrogen atom of the alkyl radical is replaced by a (CrC4-alkyl) 2 N- group which is bound through the nitrogen.
  • C3-Cn-cycloalkyl refers to a monocyclic, bicyclic or tricyclic saturated univalent hydrocarbon radical having 3 to 11 carbon ring members that is connected through one of the ring carbon atoms by substitution of one hydrogen atom, such as cyclopropyl (C3H5), cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, bicyclo[1.1.0]butyl, bicyclo[2.1.0]pentyl, bicyclo[1.1.1]pentyl, bicyclo[3.1.0]hexyl, bicyclo[2.1.1]hexyl, norcaranyl (bicyclo[4.1.0]heptyl) and norbornyl (bicyclo[2.2.1]heptyl).
  • aliphatic refers to compounds or radicals composed of carbon and hydrogen and which are non-aromatic compounds.
  • An “alicyclic” compound or radical is an organic compound that is both aliphatic and cyclic. They contain one or more all-carbon rings which may be either saturated or unsaturated, but do not have aromatic character.
  • cyclic moiety or “cyclic group” refer to a radical which is an alicyclic ring or an aromatic ring, such as, for example, phenyl or heteroaryl.
  • any of the aliphatic or cyclic groups are unsubstituted or substituted with...” refers to aliphatic groups, cyclic groups and groups, which contain an aliphatic and a cyclic moiety in one group, such as in, for example, C3-C8-cycloalkyl-Ci-C4-alkyl; therefore a group which contains an aliphatic and a cyclic moiety both of these moieties may be substituted or unsubstituted independently of each other.
  • phenyl refers to an aromatic ring systems incuding six carbon atoms (commonly referred to as benzene ring.
  • heteroaryl refers to aromatic monocyclic or polycyclic ring systems incuding besides carbon atoms, 1, 2, 3 or 4 heteroatoms independently selected from the group consisting of N,
  • saturated 3- to 7-membered carbocycle is to be understood as meaning monocyclic saturated carbocycles having 3, 4 or 5 carbon ring members. Examples include cyclopropyl, cyclopentyl, cyclohexyl, cycloheptyl, and the like.
  • 3- to 10-membered saturated, partially unsaturated or aromatic mono- or bicyclic heterocycle wherein the ring member atoms of said mono- or bicyclic heterocycle include besides carbon atoms further 1 , 2, 3 or 4 heteroatoms selected from N, O and S as ring member atoms
  • a 3- or 4-membered saturated heterocycle which contains 1 or 2 heteroatoms from the group consisting of N, O and S as ring members such as oxirane, aziridine, thiirane, oxetane, azetidine, thiethane, [1 ,2]dioxetane, [1,2]dithietane, [1,2]diazetidine
  • a 5- or 6-membered saturated or partially unsaturated heterocycle which contains 1 , 2 or 3 heteroatoms from
  • 5- or 6-membered heteroaryl or the term ”5- or 6-membered aromatic heterocycle” refer to aromatic ring systems incuding besides carbon atoms, 1, 2, 3 or 4 heteroatoms independently selected from the group consisting of N, O and S, for example, a 5-membered heteroaryl such as pyrrol-1 -yl, pyrrol-2-yl, pyrrol-3-yl, thien-2-yl, thien-3-yl, furan-2-yl, furan-3-yl, pyrazol-1-yl, pyrazol-3-yl, pyrazol-4-yl, pyrazol-5-yl, imidazol-1-yl, imidazol-2-yl, imidazol-4-yl, imidazol-5-yl, oxazol-2-yl, oxazol-4-yl, oxazol-5-yl, isoxazol-3-yl, isoxazol
  • Analytical method HPLC Agilent 1100 Series; column: Agilent Zorbax Phenyl-Hexyl 1,8pm 50*4, 6mm, Column Flow: 1 mL/min, time: 25 min, pressure: 20000 kPa; temperature: 20°C; wavelength 200 nm; injector volume: 2 uL; retention time of the respective products is based on reference material.
  • a scaleable glass vessel was charged with /V-(2-fluorophenyl)-4-[(Z)-/V i hydroxycarbamimidoyl]benzamide (437.6 g (98.9% purity, 1.584 mol), methanol (1013.5 g) and ethyl trifluoroacetate (496.0 g, purity 99.8%, 3.48 mol) under an atmosphere of nitrogen.
  • the reaction mixture was brought to 25°C and sodium methanolate (30% w/w in methanol, 370.6 g, 2.06 mol) was added over a period of 180 minutes at a temperature of 25°C under cooling. The resulting mixture was agitated at 25°C for 191 minutes.
  • Demineralized water (633.4 g) was then added at 20°C, over 15 min under agitation. The suspended solids were collected by filtration. The filter cake was washed twice with 633.4 g demineralized water. Drying under vacuum yielded the desired product as a colorless solid in 97.6% (HPLC purity: 98.1%).
  • Aqueous mother liquor obtained in Example 1) above (2019.5 g) and the first wash liquor (779.5 g) were combined and charged to a scaleable vessel fitted with a rectification column (stainless steel packaging).
  • the content of sodium trifluoroacetate in the mixture was determined by quantitative capillary electrophoresis with 1.87 mol.
  • the vessel was heated to an inside temperature of 72.8°C and the rectification was started. During the course of the rectification, the inside temperature of the vessel increased to 99.9°C. Two fractions and the content of the cooling trap were balanced. The first fraction of 1359.5 g contained 81.7% methanol, 16.47% methyl trifluoroacetate, 1.0% ethanol and 0.76% ethyl trifluoroacetate according to quantitative GC analytics. The water content was determined by Karl-Fischer Titration with 493 ppm.
  • the cooling trap contained 4.0 g (59,4 % methyl trifluoroacetate, 33.1% methanol, 1.4% ethyl trifluoroacetate, 0.3% ethanol).
  • the yield of methyl trifluoroacetate plus ethyl trifluoroacetate in respect to the analyzed sodium trifluoroacetate content of the starting mixture was calculated with 101 % (higher than 100% can be explained by uncertainties of analytics).
  • Example 3 Recycling of methyl trifluoroacetate by use of cone hydrochloric acid
  • Example 1 was repeated for the purpose of this experiment.
  • the aqueous mother liquor (2135.8 g) and the first wash liquor (633.3 g) were combined and charged to a scaleable vessel fitted with a rectification column (stainless steel packaging).
  • the content of sodium trifluoroacetate in the mixture has been determined by quantitative capillary electrophoresis with 1.87 mol.
  • the cooling trap contained 3.8 g (56.8% methyl trifluoroacetate, 32.5% methanol, 3.6% ethyl trifluoroacetate, 3.0% ethanol).
  • the yield of methyl trifluoroacetate plus ethyl trifluoroacetate in respect to the analyzed sodium trifluoroacetate has been calculated with 96.5%.

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Abstract

La présente invention concerne un procédé de production de trifluoroacétates d'alkyle par réaction d'acide trifluoroacétique avec un alcool alkylique R-OH dans une solution aqueuse, le trifluoroacétate d'alkyle étant séparé du milieu réactionnel par rectification directe. Selon un aspect, la présente invention concerne un procédé de récupération d'acide trifluoroacétique sous la forme de trifluoroacétates d'alkyle à partir de flux d'eaux usées aqueuses des transformations chimiques précédentes.
EP22735924.7A 2021-07-14 2022-07-04 Procédé de production de trifluoroacétates d'alkyle Pending EP4370509A1 (fr)

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